R Cassiopeiae: AGB Star Envelope Dynamics Charted by 86 GHz SiO Masers

Details R Cassiopeiae: AGB Star Envelope Dynamics Charted by 86 GHz SiO Masers R Cassiopeiae: AGB Star Envelope Dynamics Charted by 86 GHz SiO Masers

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19712906p&link_type=abstract

American Astronomical Society, 197th AAS Meeting, #129.06; Bulletin of the American Astronomical Society, Vol. 33, p.713

Astronomy and Astrophysics

Astronomy

Scientific paper

Coordinated Millimeter VLBI Array (CMVA) investigations at 86 GHz have mapped the SiO masers of the nearby red giant R Cassiopeiae at two closely-spaced epochs. Images taken one month apart (0.1 stellar period) show major changes in some maser clusters, although some features remain recognizable. The J=2 -> 1 transition comes from a thin, moderately turbulent shell at 1.5 to 2 photospheric radii that shows marginal evidence for expansion. These maser clusters show variations in line-of-sight velocity comparable to shell expansion rate, indicating the stellar envelope has not yet formed a predominantly radial flow at the location of the masers. Velocity gradients are evident that evoke a hybrid of large scale photospheric convective motions with an outflowing envelope. SiO maser emission from R Cas shows considerable structure even over baselines less than 50 Mλ . Spacings interior to the shortest currently available for 86 GHz VLBI/VLBA would be helpful to describe SiO emission our study does not properly account for. Operations of the CMVA and its partner telescopes are supported by the National Science Foundation.

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